I am writing a skeleton LSM module to only print the message at boot time, but I could not see any printk message in the dmesg.
Below are steps i did to enable the printk messages in the LSM module.
What i did is download linux kernel 2.6.33.3.
1) added the line source security/lsmcustommod/Kconfig in linuxsrc/security/Kconfig near ima/Kconfig.
2) added "subdir-$(CONFIG_SECURITY_LSMCUSTOMMOD) += lsmcustommod" line at linuxsrc/security/Makefile
3) created a directory in linuxsrc/security/lsmcustommod and putted three files
i) lsmcustommod.c
ii) Kconfig
iii) Makefile
Kconfig file contents
config SECURITY_LSMCUSTOMMOD
bool "LSMCUSTOMMOD Support"
depends on SECURITY
select NETWORK_SECMARK
default n
help
Makefile Contents
obj-$(CONFIG_SECURITY_LSMCUSTOMMOD) := lsmcustommod.o
lsmcustommod.c contents
static __init lsmcustommod_init(void){
/* register the hooks */
if (register_security(&lsmcustommod_ops))
panic("lsmcustommod: Unable to register lsmcustommod with kernel.\n");
else
printk("lsmcustommod: registered with the kernel\n");
return 0;
}
static void __exit lsmcustommod_exit (void)
{
return;
}
module_init (lsmcustommod_init);
module_exit (lsmcustommod_exit);
MODULE_DESCRIPTION("lsmcustommod");
MODULE_LICENSE("GPL");
#endif /* CONFIG_SECURITY_LSMCUSTOMMOD */
After that I also added some return 0 and printk statments in the lsmcustommod_ops stucture.
lastly disabled all modules in make menuconfig and select LSMCUTOMMOD in security sections of the menufile and compile the kernel by the following command.
make && make modules && make modules_install && make install
updategrub2
--
Toqeer Ali Syed
Red Hat Certified Engineer
mob: +60166205504
mob: +92 321 9059916
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